Jurnal Ilmiah Platax

Isolation and Potential of Plastic-Degrading Bacteria from Plastic Waste

Wed, 29 Jan 2025 00:00:00 +0800

Plastic waste is an environmental issue, including in marine environments. One method of managing plastic waste is through biodegradation using bacteria. This study aims to isolate bacteria from plastic waste in Malalayang, and North Sulawesi waters, and test their potential to degrade plastic using laboratory experimental methods. Bacteria were isolated using a Nutrient Agar (NA) medium and then tested for their ability to degrade plastic using a Nutrient Broth (NB) medium containing plastic fragments. The NB medium with plastic fragments was incubated using an orbital shaker at room temperature with agitation at 130 rpm for 30 days. Five bacterial isolates were successfully obtained from plastic waste: isolates C1, C2, C3, C4, and C5. Four of the bacterial isolates were found to be capable of degrading plastic, as indicated by the reduction in the dry weight of the plastic after 30 days of incubation. The highest plastic weight reduction was shown in isolate C2, with a decrease of 2.95%, while the lowest reduction was observed in isolate C4, with a decrease of 2%.

Keywords: Bacteria, Isolation, Biodegradation, Plastic.

Abstrak

Sampah plastik merupakan masalah lingkungan termasuk lingkungan laut. Salah satu pengelolaan sampah plastik adalah melalui biodegradasi menggunakan bakteri. Penelitian ini bertujuan mengisolasi bakteri dari sampah plastik Perairan Malalayang, Sulawesi Utara dan melakukan uji potensi bakteri tersebut dalam mendegradasi plastik menggunakan metode eksperimen laboratorium. Bakteri diisolasi menggunakan medium Nutrient Agar (NA), kemudian diuji kemampuan mendegradasi plastik dengan menggunakan medium Nutrient Broth (NB) yang berisi potongan plastik. Medium NB berisi potongan plastik diinkubasi menggunakan orbital shaker pada suhu ruang dengan agitasi 130 rpm selama 30 hari. Lima isolat bakteri berhasil diisolasi dari sampah plastik, yaitu isolat C₁, C₂, C₃, C₄ dan C₅. Didapatkan empat isolat bakteri yang mampu mendegradasi plastik, yang ditunjukkan dengan pengurangan berat kering plastik setelah diinkubasi selama 30 hari. Pengurangan berat plastik tertinggi ditunjukkan oleh isolat C₂sebesar 2,95 %, sedangkan pengurangan berat terendah oleh isolat C₄ sebesar 2 %.

Kata kunci: Bakteri, Isolasi, Biodegradasi, Plastik.

Variability Of Chlorophyll-A and Sea Surface Temperature in The Maluku Sea During El Nino Period 2023

Wed, 29 Jan 2025 00:00:00 +0800

Oceanographic factors such as Sea Surface Temperature (SST) and Chlorophyll-a (Chl-a) during El Nino can make fishing easier. The research aims to analyze the variability of SST and Chl-a in the Maluku Sea during El Nino 2023 and determine the influence of El Nino on upwelling in the Maluku Sea. The method used uses SST from Remote Sensing data which has been validated using observation and Chl-a data. Rainfall data is used to ascertain the climatic conditions of the North and South Maluku Sea regions. Validation of remote sensing SST data with observations has a correlation coefficient of 0.677. The research results show that in the West Monsoon of North Maluku, the SST was 29.1ºC and Chl-a 0.24 mg/m³ due to the influence of La Nina 2022 as shown by the rainfall in February of 199 mm. During the transition monsoon, the SST in the North Maluku Sea is 29.3 ºC higher than the South 29.8ºC. The East Monsoon SST in the Southern Maluku Sea experiences a decrease in temperature reaching 27.9 ºC and Chl-a of 075 mg/m³. Transition Monsoon II SST is 30ºC and Chl-a 0.21 mg/m³. The research concludes that the El Nino phenomenon that will occur in 2023 will affect upwelling in the Maluku Sea by 84%. There is a mismatch between the Chl-a peak in August SST and the SPL peak that occurred in September. When El Nino 2023 occurs, Chl-a is higher in the southern part of the Maluku Sea compared to the northern part, as is the SST.

Keywords: SST, Chl-a, East monsoon, El Nino, Upwelling

Abstrak

Mengetahui faktor oseanografi seperti Suhu Permukaan Laut (SPL) dan Klorofil-a (Chl-a) saat El Nino dapat mempermudah penangkapan ikan. Tujuan penelitian untuk menganalisis variabilitas SPL dan Chl-a di Laut Maluku saat terjadi El Nino 2023 dan mengetahui pengaruh El Nino terhadap upwelling di Laut Maluku. Metode yang digunakan menggunakan data Penginderaan Jauh SPL yang telah di validasi menggunakan data obsevasi dan Chl-a. data curah hujan digunakan untuk memastikan kondisi iklim wilayah Laut Mauluku bagian Utara dan Selatan. Validasi data SPL penginderaan jauh dengan observasi memiliki korefisien korelasi sebesar 0.677. Hasil penelitian menunjukan bahwa pada Musim Barat Laut Maluku bagian Utara dengan SPL 29.1ºC dan Chl-a 0.24 mg/m³ dikarenakan pengaruh La Nina 2022 yang ditunjukkan dari curah hujan bulan Februari sebesar 199 mm. Saat Musim peralihan SPL di Laut Maluku bagian Utara 29.3 ºC lebih tinggi dari bagian Selatan 29.8ºC. Musim Timur SPL di Laut Maluku bagian Selatan mengalami penurunan suhu mencapai 27.9 ºC dan Chl-a sebesar 075 mg/m³. Musim Peralihan II SPl sebesar 30ºC dan Chl-a 0.21 mg/m³. Kesempulan penelitain adalah ini Fenomena El Nino yang terjadi pada tahun 2023 mempengaruhi upwelling di laut maluku sebasar 84%. Terjadi ketidak seuaian antara puncak Chl-a bulan Agustus SPL dengan puncak SPL yang terjadi bulan September. Saat terjadi El Nino 2023 Chl-a lebih tinggi di Laut Maluku bagian Selatan jika dibandingkan bagian Utara, begitu pula dengan SPL.

Kata kunci: SPL, Chl-a, Musim Timur, El Nino, Upwelling

Study on the Role and Contribution of Women to the Income of Fishing Families

Grace O. Tambani, Christian Ronald Dien, Olvie Vanda Kotambunan — Wed, 29 Jan 2025 00:00:00 +0800

The purpose of this research is to carefully analyze the role of women in contributing to the income of fishing families in Tambun Village, Likupang Barat District. The research will be conducted in Tambun Village, Likupang Barat District, using the Purposive Sampling research method. The criteria for the respondents are: married, have a fisherman husband, and reside in Tambun Village. The total number of respondents is 20 people. Based on the research findings, there are two roles of women in Tambun Village: Public Role and Domestic Role. Furthermore, the research shows that women residing in Tambun Village, Likupang Barat District, North Minahasa Regency, contribute 49% to the total family income. This figure indicates that the income of women as fishermen's wives has not yet become a primary source of family income. This research will contribute to achieving the UNSRAT 2021-2025 Strategic Plan in the Maritime Excellence sector, focusing on the research topic of Empowerment and Increasing Women’s Participation and Social Inclusion in the Maritime Environment.

Keywords: Women's roles, family income, Tambun Village, tourism.

Abstrak

Tujuan penelitian ini adalah untuk menganalisis dengan cermat berapa besar peran perempuan dalam berkontribusi terhadapat pendapatan keluarga nelayan di Desa Tambun Kecamatan Likupang Barat. Lokasi penelitian akan dilaksanakan di Desa Tambun Kecamatan Likupang Barat dengan menggunakan metode penelitian Purposive Sampling, kriteria responden yaitu : sudah berumah tangga dan bersuamikan seorang nelayan dan tinggal di Desa Tambun. Jumlah responden berjumlah 20 orang. Berdasarkan hasil penelitian terdapat 2 Peran Perempuan didesa Tambun yaitu Peran Publik dan Peran Domestik selain itu berdasarkan penelitian terlihat bahwa perempuan yang bermukim Desa Tambun Kecamatan Likupang Barat Kabupaten Minahasa Utara berkonrtibusi sebesar 49 % terhadap total pendapatan keluarga. Nilai ini menunjukkan bahwa pendapatan perempuan sebagai isteri nelayan belum menjadi tumpuan pendapatan keluarga. Penelitian ini akan berkontribusi pada pencapaian RENSTRA UNSRAT 2021 – 2025 di Bidang Unggulan Kemaritiman yang difokuskan pada topik riset Pemberdayaan dan Peningkatan Partisipasi Perempuan dan Inklusi Sosial dalam Lingkungan Kemaritiman.

Kata kunci : Peran perempuan, pendapatan keluarga, Desa Tambun, Pariwisata.

Analysis of the Living Standards of Fishing Families in the Hook-and-Line Fishing Industry Based on Women's Empowerment in Tateli Village

Victoria E. N. Manoppo, Swenekhe S. Durand, Djuwita R. R. Aling — Wed, 29 Jan 2025 00:00:00 +0800

The specific objectives of this study are: Identifying and carefully explaining the standard of living of fishing families based on women's empowerment/housewives in Tateli Dua Village, Mandolang District, Minahasa Regency. 1. The method used in this study is the census method. 2 Data Collection Techniques Data collected through two sources, namely primary data and secondary data. Primary data is data that is directly obtained through direct interviews at the research location, filling out questionnaires. 3 Data Analysis Methods Analysis of research data results is divided into two types, namely quantitative analysis and qualitative analysis. Engel Index Analysis, because the Engel index is one way to reflect the standard of living of a person or group of people. The results of the analysis using the Engel Index obtained a figure of 28.52%, this means that the total income of fishermen who own fishing rods is not much, even less than half of their income is used for food needs only. It can be concluded that the level of welfare of fishermen who own fishing rods is classified as good / high because more than half of their income for food needs, namely 71.47%, is used for non-food needs. This means that their lives in the house already have other facilities, such as having a television in addition to children who are well schooled. This is greatly supported by the role of fishermen's wives in working and being able to provide economic support for the family.

Keywords: Standard of Living, Women's Empowerment, Hand Fishing

Abstrak

Tujuan khusus dalam penelitian ini, yaitu : Mengidentifikasikan dan menjelaskan dengan cermat taraf hidup keluarga nelayan pancing berbasis pemberdayaan wanita/ibu rumah tangga di Desa Tateli Dua Kecamatan Mandolang Kabupaten Minahasa. 1. Metode dalam penelitian ini dipakai metode sensus. 2 Teknik Pengumpulan Data Data yang dikumpulkan melalui dua sumber yaitu data primer dan data sekunder. Data primer adalah data yang langsung diperoleh melalui wawancara langsung di loakasi penelitian, pengisian kuisioner. 3 Metode Analisis Data Analisis data hasil penelitian dibedakan dalam dua macam, yaitu analisis kuantitatif dan analisis kualitatif. Analisis Indeks Engel, karena indeks Engel merupakan salah satu cara untuk mencerminkan taraf hidup seseorang atau sekelompok orang. Hasil analisis dengan menggunakan Indeks Engel diperoleh angka 28,52 %, ini berarti bahwa total pendapatan nelayan pemilik pancing tidak banyak bahkan tidak sampai separuh pendapatannya yang digunakan kebutuhan makanan saja. Hal ini dapat disimpulkan bahwa tingkat kesejahteraan nelayan pemilik pancing tergolong baik/tinggi karena lebih dari separuh pendapatannya kebutuhan pangan saja yaitu sebesar 71,47% digunakan untuk kebutuhan non pangan. Ini berarti kehidupan mereka di dalam rumah sudah ada fasilitas yang lain misalnya memiliki televisi disamping anak-anak yang disekolahkan dengan baik. Hal ini sangat ditunjang oleh peranan istri nelayan dalam ikut bekerja dan bisa memberikan dukungan ekonomi bagi keluarga.

Kata kunci : Taraf Hidup, Pemberdayaan Wanita, Pancing Ulur.

Analysis of the Empowerment Level of Smoked Fish Processors Tandipang (Dussumieria acuta)

Srie J. Sondakh, Siti Suhaeni, Steelma Rantung — Wed, 29 Jan 2025 00:00:00 +0800

The method used in this study is the case study method. Data were collected from two sources, namely primary data and secondary data. The population in this study consists of smoked Tandipang fish processors in Tumpaan Subdistrict. Data collection was done using the census method, where the entire population was selected as respondents, with 14 smoked Tandipang fish processors chosen as the sample. The data collected include primary and secondary data. Primary data was gathered through observations and interviews guided by a questionnaire, while the data obtained were analyzed using both quantitative and qualitative descriptive analysis. Family welfare was measured based on objective and subjective welfare. The analysis concluded that the average annual income of smoked Tandipang fish processors in Tumpaan Subdistrict is IDR 88,168,000, earned from working as fish processors and side jobs. The fishermen’s family expenditures consist of food and non-food expenses, with 85.68% of their total income spent solely on food. The empowerment level of traditional fishermen in Belang Subdistrict is still considered low from both economic and non-economic aspects. Economically, more than 50% of fishermen’s income is used to meet food needs only. From all non-economic aspects, the community of smoked Tandipang fish processors in the Tumpaan Subdistrict is also still categorized as lacking empowerment.

Keywords: Hygienic, industry, sanitation, fiber.

Abstrak

Metode yang dipakai dalam penelitian ini adalah metode studi kasus. Data yang dikumpulkan melalui dua sumber yaitu data primer dan data sekunder. Populasi dalam penelitian ini adalah pengolah ikan Tandipang asap yang ada di Kecamatan Tumpaan. Teknik pengambilan data dilakukan dengan metode sensus, yaitu seluruh populasi akan diambil sebagai responden dan dipilih sebanyak 14 responden pengolah ikan tandipang asap. Data yang dikumpulkan berupa data primer dan data sekunder. Teknik pengumpulan data primer dengan observasi dan wawancara yang dipandu dengan kuesioner, sedangkan data yang diperoleh dianalisis dengan menggunakan analisis deskriptif kuantitatif dan deskriptif kualitatif. Kesejahteraan keluarga diukur berdasarkan kesejahteraan objektif dan kesejahteraan subjektif. Berdasarkan hasil analisis, disimpulkan bahwa rata-rata pendapatan keluarga pengolah ikan Tandipang asap yang ada di Kecamatan Tumpaan per tahun adalah Rp.88.168.000 yang diperoleh dari bekerja sebagai pengolah ikan dan pekerjaan sampingan. Pengeluaran keluarga nelayan terdiri dari pengeluaran untuk pangan dan non pangan, 85,68% dari total pendapatan nelayan hanya untuk memenuhi kebutuhan makanan saja. Tingkat keberdayaan nelayan tradisional di Kecamatan Belang masih termasuk rendah dilihat dari aspek ekonomi maupun non ekonomi. Secara ekonomi karena sebagian besar atau lebih dari 50% pendapatan nelayan hanya digunakan untuk memenuhi kebutuhan pangan saja. Dilihat dari semua aspek non ekonomi masyarakat pengolah ikan Tandipang asap yang ada di Kecamatan Tumpaan juga masih dikategorikan kurang berdaya

Kata kunci: Higienis, industri, sanitasi, serat.

Management Strategies for Sea Cucumber (Holothuroidea) Fisheries Resources in West Likupang Sub-district

Wed, 29 Jan 2025 00:00:00 +0800

Indonesia is a tropical country with high marine biodiversity, including sea cucumber. The high demand for sea cucumber has led fishermen to catch sea cucumber regardless of the type or size suitable for harvesting. The lack of cultivation and regulations governing the protection of sea cucumbers has caused some species to be endangered. Sea cucumber species with high selling prices are increasingly difficult to find in West Likupang District. This study aims to identify strategies for managing sea cucumber fisheries sustainably and provide policy recommendations for their sustainable management in West Likupang District. This study used a survey method and then analyzed it with a SWOT analysis (strengths, weaknesses, opportunities, threats). The SWOT analysis reveals several strategies for achieving sustainable sea cucumber fisheries: legislation, conservation efforts, aquaculture development, regulated fishing, proper post-harvest handling, and educating fishermen on regulations.

Keywords: Management, regulation, conservation, sea cucumber, SWOT

Abstrak

Indonesia merupakan negara tropis yang mempunyai keanekaragaman hayati laut yang tinggi, salah satunya ialah sumber daya trepang (Holothuridea). Permintaan pasar yang tinggi terhadap trepang, menyebabkan nelayan menangkap trepang tanpa mengindahkan jenis dan ukuran yang layak panen. Belum adanya budi daya dan regulasi yang mengatur perlindungan terhadap trepang menyebabkan beberapa spesies sudah terancam punah. Spesies trepang dengan harga jual yang tinggi makin sulit ditemukan terutama di Kecamatan Likupang Barat. Penelitian ini bertujuan untuk menentukan strategi pengelolaan sumber daya perikanan trepang, untuk mencapai perikanan trepang yang berkelanjutan, dan membuat rujukan atau rekomendasi kebijakan untuk pengelolaan sumber daya perikanan trepang (Holothuroidea) yang berkelanjutan secara umum Di Provinsi Sulawesi Utara, khususnya di Likupang Kabupaten Minahasa Utara. Penelitian ini menggunakan metode survei kemudian dianalisis dengan analisis SWOT (kekuatan, kelemahan, peluang, dan ancaman). Berdasarkan hasil analisis, terdapat beberapa strategi yang dapat dikembangkan untuk mencapai perikanan trepang yang berkelanjutan, yakni: regulasi berupa peraturan perundangan, upaya konservasi, pengembangan usaha budidaya, penangkapan yang terukur, penanganan pasca panen/penangkapan dari alam, dan sosialisasi kepada nelayan terkait peraturan

Kata kunci: Pengelolaan, regulasi, konservasi, trepang, SWOT

Comcot 1.7 Modeling To Estimate The Maximum Height And Arrival Time Of The Tsunami In Tombariri Sub-District

Wed, 29 Jan 2025 00:00:00 +0800

Tombariri Sub-District is located on the North Coast of the Minahasa Peninsula, directly opposite the North Sulawesi Subduction. North Sulawesi subduction has the potential for earthquakes with a targeted magnitude of M8.5 that can generate tsunamis. In addition, Tombariri Sub-District has a fairly large population density and is located on the coast. This causes the Tombariri Sub-District to be highly vulnerable to tsunami hazards. This study aims to determine the tsunami's estimated maximum height and arrival time. The modeling method in this study is through the Comcot 1.7 application with the worst-case scenario of North Sulawesi Subduction M8.5. The results of this study showed that the maximum height of the tsunami reached 6.17 m. The estimated time of tsunami arrival in Tombariri District ranges from 5-10 minutes. The results of this study can be used as a means of mitigating tsunami disasters.

Keywords: Comcot, Tsunami Modeling, Inundation, Numeric Simulation

Abstrak

Kecamatan Tombariri terletak di wilayah Pesisir Utara Semenanjung Minahasa yang berhadapan langsung dengan Subduksi Sulawesi Utara. Subduksi Sulawesi Utara memiliki potensi gempabumi dengan magnitudo tertarget M8.5 yang dapat membangkitkan tsunami. Selain itu, Kecamatan Tombariri memiliki kepadatan penduduk yang cukup besar dan berada di wilayah pesisir. Hal ini menyebabkan Kecamatan Tombariri memiliki tingkat kerawanan terhadap bahaya tsunami yang tinggi. Penelitian ini bertujuan untuk mengetahui estimasi ketinggian maksimum dan waktu tiba tsunami. Metode pemodelan dalam penelitian ini melalui aplikasi Comcot 1.7 dengan skenario terburuk Subduksi Sulawesi Utara M8,5. Hasil dari penelitian ini menunukkan bahwa tinggi maksimum tsunami mencapai 6,17 m. Estimasi waktu tiba tsunami di Kecamatan tombariri berkisar antara 5 - 10 menit. Hasil dari penelitian ini dapat digunakan sebagai sarana mitigasi bencana tsunami.

Kata Kunci : Comcot, Pemodelan tsunami, Simulasi Numerik.

Community Structure of Macroalgae in the Coastal Waters of Tiwoho Village, Wori District, North Minahasa Regency

Wed, 29 Jan 2025 00:00:00 +0800

The purpose of this study is to describe the morphology and anatomy of each macroalgae species and to analyze the community structure of macroalgae from the study location. Data collection was carried out using the Line Transect method with quadrat sampling techniques conducted at the lowest tide. Temperature measurement was done using a thermometer and salinity using a refractometer, while substrate determination was visually assessed based on the type of substrate. The results of this study found 7 species, consisting of 1 species of red algae, 4 species of brown algae, and 2 species of green algae. The morphology of these algae types varies with different anatomies based on cross and longitudinal sections of each part of the algal thallus. The highest species density was Turbinaria ornata (transect 1), while the lowest density was Halimeda opuntia and Sargassum polycystum (transect 1), Turbinaria ornata (transect 2 and transect 3). The macroalgae diversity index values on the three transects were in the medium category. The species evenness index values on the three transects were stable. The species richness index values on the three transects were in the low category. The dominance index values on the three transects were in the low category.

Keywords: Macroalgae, Community, Transect, Quadrat, Tiwoho.

Abstrak

Tujuan penelitian ini adalah mendeskripsikan morfologi dan anatomi masing-masing spesies makroalga, dan menganalisis stuktur komunitas makroalga dari lokasi penelitian. Pengambilan data menggunakan metode Line Transect dengan teknik sampling kuadrat yang dilakukan pada saat surut terendah. Pengukuran suhu menggunakan Termometer dan salinitas menggunakan Refraktometer, dan untuk penentuan substrat dilihat secara visual jenis dari substrat tersebut. Hasil penelitian ini ditemukan 7 spesies yang terdiri dari 1 spesies alga merah, 4 spesies alga coklat dan 2 spesies alga hijau. Morfologi jenis-jenis alga tersebut beragam dengan anatomi yang berbeda berdasarkan potongan melintang dan memanjang dari masing-masing bagian thallus alga. Kepadatan spesies tertinggi yaitu Turbinaria ornata (transek 1) sedangkan kepadatan terendah yaitu Halimeda opuntia dan Sargassum polycystum (transek 1), Turbinaria ornata (transek 2 dan transek 3). Nilai indeks keanekaragaman makroalga pada ketiga transek termasuk dalam kategori sedang. Nilai indeks kemerataan jenis pada ketiga transek termasuk dalam keadaan stabil. Nilai indeks kekayaan jenis pada ketiga transek termasuk dalam kategori rendah. Nilai indeks dominasi pada ketiga transek termasuk dalam kategori rendah.

Kata kunci: Makroalga, Komunitas, Transek, Kuadrat, Tiwoho.

Study of Scleractinian Coral Recruitment in the Waters of Tanjung Pisok and Siladen Island, Bunaken National Park

Wed, 29 Jan 2025 00:00:00 +0800

The research aimed to determine the recruitment density value of scleractinian coral juveniles in Tanjung Pisok (Meras and Bahowo) and Siladen Island. The method for selecting observation locations uses purposive sampling and collecting coral juvenile recruitment data using underwater photo transects. The results of this research obtained data on genus, size, and density values for coral juvenile recruitment. The coral genera found at Station I were 19 genera with the largest number being the Porites genus, 32 colonies, Station II 13 genera with the largest number being the Favites genus, 32 colonies, and at Station III 17 genera with the largest number being the Porites genus, 32 colonies. Coral juveniles in this study were more dominant in the 2 cm - 2.9 cm size group, for Station I 63 colonies, Station II 54 colonies and Station III 32 colonies. Based on the results of this research, it shows that the coral recruitment density at Station I with a value of 12.38 colonies/m² is higher than Station II, the coral recruitment density at Station II with a value of 12.23 colonies/m² is higher than Station III with a value of 7.21 colonies/m².

Keywords: Recruitment; Scleractinia; Underwater Photo Transect; Bunaken National Park

Abstrak

Tujuan penelitian menentukan nilai densitas rekrutmen juvenil karang scleractinia di perairan Tanjung Pisok (Meras dan Bahowo) dan pulau Siladen. Metode pemilihan lokasi pengamatan menggunakan purposive sampling dan metode pengumpulan data rekrutmen juvenil karang menggunakan underwater photo transect. Hasil penelitian ini memperoleh data genus, ukuran dan nilai densitas rekrutmen juvenil karang. Genus karang yang didapat di Stasiun I yaitu 19 genus dengan yang terbanyak genus Porites 32 koloni, Stasiun II 13 genus dengan yang terbanyak genus Favites 32 koloni, dan Stasiun III 17 genus dengan yang terbanyak genus Porites 32 koloni. Juvenil karang dalam penelitian ini lebih dominan pada kelompok ukuran 2 cm - 2.9 cm, untuk Stasiun I 63 koloni, Stasiun II 54 koloni dan Stasiun III 32 koloni. Berdasarkan hasil penelitian ini menunjukkan densitas rekrutmen karang di Stasiun I dengan nilai 12,38 koloni/m² lebih tinggi dari Stasiun II, densitas rekrutmen karang di Stasiun II dengan nilai 12,23 koloni/m² lebih tinggi dari Stasiun III dengan nilai 7,21 koloni/m².

Kata kunci: Rekrutmen; Scleractinia; Taman Nasional Bunaken; Underwater Photo Transect

Indicator Species and Diversity in Mangroves at Darunu Mangrove Park

Wed, 29 Jan 2025 00:00:00 +0800

Mangrove ecosystems play a crucial role in maintaining the ecological balance of coastal areas, including protection against abrasion, providing habitat for marine species, and acting as a carbon sink. This study aims to identify indicator species and analyze biodiversity in Darunu Mangrove Park, Darunu Village, Wori Subdistrict, North Minahasa Regency. The research was conducted over three months (May–July 2024) using a line transect method for vegetation data collection. The results show that three dominant mangrove species were identified: Rhizophora apiculata, Rhizophora mucronata, and Sonneratia alba. R. mucronata exhibited significant dominance, both in terms of mature trees and saplings, and had the highest Important Value Index (IVI). The mangrove species diversity in this area is classified as low, with the. Diversity Index (H’) indicates an imbalance in the ecosystem's species composition. The Dominance Index (C) and Evenness Index (E) analyses indicate strong dominance by certain species, particularly R. mucronata. This study recommends the importance of enhanced monitoring and more intensive conservation efforts, including the replanting of threatened mangrove species and raising community awareness of mangrove ecosystem conservation.

Keywords: Darunu Mangrove Park, Diversity, Indicator Species, Important Value Index.

Abstrak

Ekosistem mangrove memiliki peran penting dalam menjaga keseimbangan ekologi pesisir, meliputi perlindungan terhadap abrasi, penyedia habitat bagi spesies laut, dan sebagai penyerap karbon. Penelitian ini bertujuan untuk mengidentifikasi spesies indikator dan menganalisis keanekaragaman hayati di Darunu Mangrove Park, Desa Darunu, Kecamatan Wori, Kabupaten Minahasa Utara. Penelitian dilaksanakan selama tiga bulan (Mei-Juli 2024) dengan menggunakan metode transek garis untuk pengambilan data vegetasi. Hasil penelitian menunjukkan bahwa terdapat tiga jenis mangrove dominan, yaitu R. apiculata, R. mucronata, dan S. alba. Jenis R. mucronata menunjukkan dominasi yang signifikan, baik pada tingkat pohon maupun pancang, serta memiliki nilai Indeks Nilai Penting (INP) tertinggi. Keanekaragaman jenis mangrove di kawasan ini tergolong rendah dengan Indeks Keanekaragaman (H’) menunjukkan ketidakseimbangan spesies dalam ekosistem. Analisis Indeks Dominansi (C) dan Indeks Kemerataan (E) mengindikasikan adanya dominasi yang kuat dari beberapa spesies tertentu, terutama R. mucronata. Penelitian ini merekomendasikan pentingnya pemantauan dan upaya konservasi yang lebih intensif, termasuk penanaman kembali spesies mangrove yang terancam dan peningkatan kesadaran masyarakat terhadap pelestarian ekosistem mangrove.

Kata kunci: Darunu Mangrove Park, Indeks Nilai Penting, Keanekaragaman, Spesies indicator

Blister Pearl Formation in Abalone, Haliotis varia Using Anestesia

Thu, 20 Feb 2025 00:00:00 +0800

Abalone pearl farming has significant potential to improve the livelihoods of coastal communities. This study aimed to measure early pearl blister layer thickness and analyze mortality in Haliotis varia following nucleus insertion. A four-month experimental study was conducted in Pulisan, North Sulawesi, Indonesia. Forty abalones underwent nucleus insertion using quick-drying adhesive after being anesthetized with benzocaine (1200 mg/L). Samples were collected monthly for two months to measure pearl layer thickness. Results showed that the average pearl layer thickness increased from 0.093 mm in the first month to 0.145 mm in the second month. However, mortality was highest in the treatment group (30%), followed by the control group with anesthesia (20%), and the control group without treatment (5%). This study concludes that pearl formation in H. varia is continuous but that insertion and anesthesia procedures stress individuals. These findings provide a foundation for developing more efficient and sustainable abalone pearl farming techniques.

Keywords: Pearl, Pearl Production, Abalone, Haliotis varia, Anestesia.

Abstrak

Produksi mutiara abalone memiliki potensi besar untuk meningkatkan kesejahteraan masyarakat pesisir. Penelitian ini bertujuan untuk mengukur pertumbuhan awal lapisan mutiara blister dan menganalisis mortalitas pada abalone Haliotis varia setelah proses insersi inti mutiara. Penelitian eksperimental ini dilakukan selama 4 bulan di perairan Pulisan, Sulawesi Utara. Sebanyak 40 individu abalone diinsersi inti mutiara menggunakan lem cepat kering setelah dibius dengan benzocaine (1200 mg/L). Sampel diambil setiap bulan selama dua bulan untuk mengukur ketebalan lapisan mutiara yang terbentuk. Hasil penelitian menunjukkan bahwa rata-rata ketebalan lapisan mutiara meningkat dari 0,093 mm pada bulan pertama menjadi 0,145 mm pada bulan kedua. Namun, mortalitas tertinggi (30%) terjadi pada kelompok perlakuan insersi, diikuti oleh kelompok kontrol dengan perlakuan anestesi (20%) dan kelompok kontrol tanpa perlakuan (5%). Studi ini menyimpulkan bahwa proses pembentukan mutiara pada H. varia berlangsung terus-menerus, namun prosedur insersi dan anestesi memberikan tekanan pada individu abalone. Penelitian ini memberikan dasar penting untuk pengembangan teknik produksi mutiara abalone yang lebih efisien dan berkelanjutan.

Kata kunci: Mutiara, Produksi Mutiara, Abalone, Haliotis varia, Anestesi.

Induction Time And Sedative (Recovery) Time In Closed System Transportation Of Tawes Fish (Barbonymus gonionotus) Anesthetized With Clove Oil At Different Temperatures

Sat, 15 Mar 2025 00:00:00 +0800

The conservation of tawes fish (Barbonymus gonionotus) is carried out through aquaculture and restocking, where seed transportation is a crucial factor affecting survival rates. Mishandling during transport can increase stress, metabolism, and mortality risk. Reducing stress during transport can be achieved by using natural anesthetic agents such as clove oil (Eugenia aromatica) and low-temperature regulation. This study aims to analyze the effects of clove oil dosage and temperature on the induction time and recovery of tawes fish seeds. The experiment was designed using a completely randomized design (CRD) with two factors: clove oil dosage (0 ppm, 5 ppm, 10 ppm) and temperature (16–19°C and 24–27°C), with 18 experimental units (3 replications). Data were analyzed using ANOVA (JMP-SAS). The results showed that combining clove oil and temperature significantly affected induction and recovery times. The 10 ppm clove oil treatment at 16–19°C resulted in the fastest induction time, while the 0 ppm treatment at 24–27°C led to the fastest recovery. The interaction between these factors demonstrated that clove oil significantly influenced the fish's response to temperature changes.

Keywords: tawes fish seed, transportation, temperature, clove oil, induction, sedative.

Abstrak

Pelestarian ikan tawes (Barbonymus gonionotus) dilakukan melalui budidaya dan restocking, di mana transportasi benih menjadi faktor krusial yang memengaruhi tingkat kelangsungan hidupnya. Kesalahan dalam penanganan dapat meningkatkan stres, metabolisme, dan risiko kematian benih. Upaya menekan stres selama transportasi dilakukan dengan penggunaan agen pembius alami, seperti minyak cengkih (Eugenia aromatica) dan pengaturan suhu rendah.Penelitian ini bertujuan menganalisis pengaruh dan dosis minyak cengkih serta suhu terhadap waktu induksi dan pemulihan (recovery) benih ikan tawes. Percobaan menggunakan rancangan acak lengkap (RAL) dengan dua faktor: dosis minyak cengkih (0 ppm, 5 ppm, 10 ppm) dan suhu (16–19°C dan 24–27°C), dengan 18 unit percobaan (3 ulangan). Data dianalisis menggunakan ANOVA (JMP-SAS).Hasil penelitian menunjukkan bahwa kombinasi minyak cengkih dan suhu berpengaruh signifikan terhadap waktu induksi dan pemulihan benih. Perlakuan 10 ppm minyak cengkih pada suhu 16–19°C menghasilkan waktu induksi tercepat, sedangkan tanpa minyak cengkih pada suhu 24–27°C mempercepat pemulihan. Interaksi kedua faktor ini menunjukkan bahwa minyak cengkih secara nyata mempengaruhi respons ikan terhadap perubahan suhu.

Kata kunci: benih tawes, transportasi, suhu, minyak cengkih, induksi, sedatif.

Priority Strategy for Mangrove Ecotourism Development at Budo Tourism Village

Sat, 15 Mar 2025 00:00:00 +0800

This study was conducted for three months, starting from March to June 2024. The research method used was a qualitative descriptive method with a survey technique. Data collection was carried out by collecting primary data and secondary data. Data analysis to formulate priority strategies for developing mangrove ecotourism at Budo Tourism Village using SWOT analysis (strength, weakness, opportunity, threat) and strategy choice analysis to obtain key success factors (priority strategies). The results of this research obtained 7 (seven) priority strategies that can be used by stakeholders, especially BUMDES managers in Budo Village for the development of sustainable mangrove ecotourism. To create a public policy, it is recommended to the Budo Village government, especially the BUMDES manager, to pay attention and consider academic studies from the Faculty of Fisheries and Marine Sciences, UNSRAT, in the form of 7 (seven) key success factors or priority strategies.

Keywords: key success factors, mangrove ecotourism, SWOT, strategic choice analysis

Abstrak

Riset ini dilaksanakan di kawasan ekowisata mangrove Desa Wisata Budo dan berlangsung selama 3 bulan, dimulai dari bulan Maret sampai Juni 2024. Metode riset yang digunakan yaitu metode deskriptif kualitatif dengan teknik survei. Pengumpulan data dilakukan dengan mengumpulkan data primer dan data sekunder. Analisis data untuk merumuskan strategi pengembangan ekowisata mangrove Desa Wisata Budo menggunakan analisis SWOT (strength, weakness, opportunity, threat) dan analisis pilihan strategi untuk memperoleh faktor-faktor kunci keberhasilan (strategi prioritas). Hasil penelitian ini memperoleh 7 (tujuh) urutan strategi prioritas yang dapat digunakan oleh stakeholders, khususnya pengelola BUMDES Desa Budo untuk pengembangan ekowisata mangrove yang berkelanjutan. Dalam rangka membuat suatu kebijakan publik direkomendasikan kepada pemerintah Desa Budo, khususnya pengelola BUMDES untuk memperhatikan dan mempertimbangkan kajian akademik dari Fakultas Perikanan dan Ilmu Kelautan Unsrat berupa 7 (tujuh) faktor-faktor kunci keberhasilan atau strategi prioritas tersebut.

Kata kunci: Analisis pilihan strategi, ekowisata mangrove, faktor-faktor kunci keberhasilan, SWOT

Nudibranchia Species, Water Quality and Substrate at Malalayang Dua Beach, Manado City

Sat, 15 Mar 2025 00:00:00 +0800

This research used the exploration method, where a dive team of three people descended to a subtidal depth of 3 to 10 meters. The dive team surveyed this site for 40 minutes. Measurements of environmental parameters seawater temperature, salinity, pH, dissolved oxygen (DO), Total Dissolved Solids (TDS), and turbidity—were taken using a Horiba U-536 and pH meter. The results identified 11 species. The average pH was 8.24 at Station A (Gasoline Station) and 8.06 at Station B (Malalayang Beach Walk). The average seawater temperature was 28.69°C at Station A and 29.08°C at Station B. Turbidity was 0 NTU at both stations. The dose of dissolved oxygen (DO) was 6.77 mg/L at Station A and 6.92 mg/L at Station B. The salinity was 31.49 ppt at Station A and 31.35 ppt at Station B. Except for TDS, all environmental parameters support Nudibranchia's life. Total Dissolved Solids (TDS) values were 57.73 g/L at Station A and 57.33 g/L at Station B, respectively. These TDS values are unsuitable for benthic marine life since they do not fit their range tolerances. Nudibranchia attached on substrates variations from dead coral with algae (DCA), sponge, algae, and dead coral fragments. The most dominant substrate occupied by Nudibranchia was dead coral with algae (DCA).

Keywords: Nudibranchia, Species, Water Quality, Substrate, Malalayang Dua

Abstrak

Penelitian ini menggunakan metode eksplorasi, di mana tim penyelam yang terdiri dari tiga orang turun ke kedalaman subtidal 3 hingga 10 meter. Tim penyelam melakukan survei di lokasi ini selama 40 menit. Pengukuran parameter lingkungan seperti suhu air laut, salinitas, pH, oksigen terlarut (DO), Total Dissolved Solids (TDS), dan kekeruhan diambil menggunakan Horiba U-536 dan pH meter. Hasil penelitian mengidentifikasi 11 spesies. Rata-rata pH adalah 8,24 di Stasiun A (Gasoline Station) dan 8,06 di Stasiun B (Malalayang Beach Walk). Suhu air laut rata-rata adalah 28,69°C di Stasiun A dan 29,08°C di Stasiun B. Kekeruhan adalah 0 NTU di kedua stasiun. Oksigen terlarut (DO) adalah 6,77 mg/L di Stasiun A dan 6,92 mg/L di Stasiun B. Salinitas adalah 31,49 ppt di Stasiun A dan 31,35 ppt di Stasiun B. Kecuali untuk TDS, semua parameter lingkungan mendukung kehidupan Nudibranchia. Nilai Total Dissolved Solids (TDS) adalah 57,73 g/L di Stasiun A dan 57,33 g/L di Stasiun B. Nilai TDS ini tidak sesuai dengan toleransi kehidupan ‘benthic’ dasar. Dalam penelitian ini, diasumsikan bahwa konsentrasi TDS juga tidak sesuai untuk Nudibranchia. Nudibranchia menempel pada variasi substrat seperti dead coral with alga (DCA), spons, alga, dan pecahan karang mati. Substrat yang paling dominan ditempati oleh Nudibranchia adalah dead coral with alga (DCA).

Kata Kunci: Nudibranchia, Jenis-jenis, Kualitas Air, Substrat, Malalayang Dua.

Optimisation Of Papain Enzyme Use As An Effort To Increase The Hatching Degree Of Mutiara Catfish (Clarias gariepinus) Eggs

Mon, 24 Mar 2025 00:00:00 +0800

This study aims to analyze the effect of commercial papain enzyme with different concentrations and duration of soaking on increasing the degree of hatching of pearl catfish (Clarias gariepinus) eggs. The study used a Randomised Group Design (RAK) with variations in papain enzyme concentration (0, 2, 4, 6, and 8 ppm) and soaking duration (5, 10, and 15 minutes). The results showed that papain enzyme concentration and soaking duration significantly affected the degree of hatching (p < 0,001). The optimal concentration of papain enzyme was 6 ppm with a soaking duration of 10 minutes, resulting in the highest hatching rate of 70,52%±2,92. The lowest egg adhesion was produced at a concentration of 8 ppm with a duration of 15 minutes (32%±4,00), while the highest degree of fertilization was directed at a concentration of 6 ppm with a duration of 10 minutes (79%±3,61). The measurement results of water quality parameters are: temperature 25,6-26,4°C, pH 7,12-7,47, and dissolved oxygen 4,06-4,41 ppm. These results indicate that the papain enzyme effectively reduces egg adhesion and increases the hatching rate of pearl catfish eggs.

Keywords: mutiara catfish; papain enzyme; hatching rate; concentration; immersion duration.

Abstrak

Penelitian ini bertujuan untuk menganalisis pengaruh enzim papain komersial dengan konsentrasi dan durasi perendaman yang berbeda terhadap peningkatan derajat penetasan telur ikan lele mutiara (Clarias gariepinus). Penelitian menggunakan Rancangan Acak Kelompok (RAK) dengan variasi konsentrasi enzim papain (0, 2, 4, 6 dan 8 ppm) dan durasi perendaman (5, 10 dan 15 menit). Hasil penelitian menunjukkan bahwa konsentrasi enzim papain dan durasi perendaman berpengaruh signifikan (p <0,001) terhadap derajat penetasan. Konsentrasi optimal enzim papain adalah 6 ppm dengan durasi perendaman 10 menit, menghasilkan derajat penetasan tertinggi sebesar 70,52%±2,92. Daya rekat telur terendah dihasilkan pada konsentrasi 8 ppm dengan durasi 15 menit (32%±4,00), sedangkan derajat pembuahan tertinggi dihasilkan pada konsentrasi 6 ppm dengan durasi 10 menit (79%±3,61). Hasil pengukuran parameter kualitas air yaitu: suhu 25,6–26,4°C, pH 7,12–7,47 dan oksigen terlarut 4,06–4,41 ppm. Hasil ini menunjukkan bahwa enzim papain efektif mengurangi daya rekat telur dan meningkatkan derajat penetasan telur ikan lele mutiara.

Kata kunci: ikan lele mutiara; enzim papain; derajat penetasan; konsentrasi; durasi perendaman

Study of e-DNA Quality at Fishing Ground of Manado Bay, North Sulawesi Province.

Mon, 24 Mar 2025 00:00:00 +0800

We used the Nansen Bottle Sampler to collect water samples in the deepsea area, ranging from 150 meters to 175 meters in six water points around Manado Bay, to test the quality of e-DNA water samples to detect target species in the fishing area. Therefore, the basis of the case study method with a sampling technique was carried out on July 29 2023 using Power Water Sterivex Kits, water samples were then stored at -25⁰C and were then taken to TBRC, University of the Ryukyus for further laboratory works, such as; eDNA extract, eDNA quality testing, 1st and 2nd PCR and Electrophoresis eDNA analysis processes using MiFish-U primers with a target of 163–185bp and 375 bp, following the MiFish protocol. Based on the results of the eDNA extract solution, it is known that the quality of eDNA from the 6 sampling sites locations ranged between 2.8 µg/mL – 4.4 µ g/mL, which means a good quality of eDNA. Moreover, it showed that the presence of DNA fragments at Kappa 60◦C Gelelectrophoresis 1st-PCR, 12S rRNA gene product (163–185bp), and Kappa 60◦C and 65◦C Geklelectrophoresis 2nd-PCR Products according to the target amplicon 375 bp. This means we can conduct the next step, the PCR sequence analysis. Then, eDNA quality testing, 1st and 2nd PCR, and Electrophoresis of e-DNA analysis process were using MiFish-U F/R primers with a target of 375 bp, it is known that the concentration of Nanodrop from the 6 sampling locations ranges between 2.8 µg/mL – 4.4 µg/mL while the core or quality eDNA ranged from 1.56 µg/mL – 2.50 µg/mL. Based on identification results, five types of species were detected; Myctophum lychnobium, Selar crumenophthalmus, Photonectes sp., Oreochromis sp. Thunnus obesus and Homo sapiens were generated using eDNA metabarcoding on the mitochondria genome database MitoFish.

Keywords: e-DNA, eDNA quality, species target, fishing area, Manado Bay

Abstrak

Kami menggunakan Nansen Bottle Sampler untuk mengambil sampel air pada laut dalam berkisar 150meter sampai 175 meter di enam titik perairan Sekitar Teluk Manado, untuk menguji Kualitas e-DNA sample air yang digunakan untuk mendeteksi target spesies pada daerah penangkapan.

Selanjutnya dasar metode studi kasus dengan teknik pengambilan sampel secara sampling dilakukan pada tanggal 29 Juli 2023 menggunakan Power Water Sterivex Kits, sapel air disimpan pada -25⁰C yang selanjutnya dibawa ke TBRC, University of the Ryukyus untuk pnelitian laboratorium lanjutan seperti ekstrak eDNA, Pengujian kualitas eDNA, 1^st and 2^nd PCR dan Elektrophoresis proses analisis eDNA menggunakan primer MiFish-U dengan target 375 bp, mengikuti MiFish protokol.

Berdasarkan hasil pengujian larutan ekstrak eDNA diketahui bahwa kualitas eDNA dari 6 titik lokasi sampling berkisar antara 2.8 ng/mL – 4.4 ng/mL dan menunjukkan adanya fragment DNA pada Kappa 60◦C Geklelectrophoresis 1^st-PCR Produk 12S rRNA gene (163–185bp, dan Kappa 60◦C dan 65◦C Geklelectrophoresis 2nd-PCR Produk sesuai amplikon target 375 bp. Hal ini berarti dapat dilanjutkan pada tahap analisis sekuens PCR.

Pengujian kualitas eDNA, 1^st and 2^nd PCR dan Elektrophoresis proses analisis eDNA menggunakan primer MiFish-U F/R dengan target 375 bp, diketahui bahwa konsentrasi Nanodrop dari 6 titik lokasi sampling berkisar antara 2.8 µg/mL – 4.4 µg/mL sedangkan kemurnian atau kualitas eDNA berkisar antara 1.56 µg/mL – 2.50 µg/mL. Hasil identifikasi menyatakan lima jenis spesies terdeteksi; Myctophum lychnobium, Selar crumenophthalmus, Photonectes sp., Oreochromis sp. Thunnus obesus, Homo sapiens dihasilkan dengan menggunakan eDNA metabarcoding pada MitoFish database genom mitokondria.

Kata kunci : e- DNA, kualitas eDNA, target spesies, daerah penangkapan, Teluk Manado.

Analysis Of Tsunami Hazard Potential On The Coast Of Bitung City, North Sulawesi

Frangky Octavian Ulus, Stephanus Vianny Mandagi, Deiske Adeliene Sumilat — Mon, 24 Mar 2025 00:00:00 +0800

This thesis aims to study the tsunami hazards in the Maluku Sea region, particularly in the coastal area of Bitung, Indonesia. The research focuses on modeling and analyzing the potential tsunamis triggered by earthquake events in that region. The data used includes bathymetry, topography, coastline, and river data obtained from the Geospatial Information Agency (Badan Informasi Geospatial-BIG). The tsunami modeling process utilizes the software COMCOT (Cornell Multi-grid Coupled Tsunami). The earthquake source parameters (PusGen) used in the modeling, such as magnitude, focal depth, length of the fault plane, the width of the fault plane, dislocation of the fault plane, strike, dip, slip/rake, and modeling area, were obtained from worst-case scenarios based on PusGen's research results. The research consists of two main stages: the pre-verification stage, where data processing and tsunami modeling are conducted, and the verification stage, where field surveys are carried out to determine the coordinates for Temporary Evacuation Sites (TEP) and Final Evacuation Sites (FEP). Various equipment, such as GPS, altimeters, stopwatches, cameras, and drones, are used during the field verification. The research procedures include a literature review, data collection of topography, bathymetry, earthquake parameters, and fault mechanism. Subsequently, tsunami modeling is conducted, and hazard analysis is performed based on the model results. Tsunami hazard maps are generated to highlight high-risk areas in the coastal region of Bitung, and evacuation routes are identified to prepare the coastal community of Bitung to face potential tsunami threats. The research offers important information to assist in the development of warning systems and efficient evacuation strategies to protect the coastal community of Bitung from tsunamis' devastating impacts.

Keywords: Tsunami; Bitung; coastal area; earthquake; PusGen

The Function Of Spatial Planning In Maintaining The Environmental Preservation Of West Pasaman District

Thu, 27 Mar 2025 00:00:00 +0800

Abstract:

This research examines the role of spatial planning in preserving the environment in West Pasaman Regency. The main aim of this research is to evaluate how the implementation of spatial planning can support environmental conservation efforts. The method used is qualitative descriptive analysis with a case study approach. Data was collected through in-depth interviews, field observations, and analysis of spatial planning documents. The research results show that good and well-planned spatial planning can reduce pressure on natural resources and improve the quality of the living environment. However, challenges such as weak law enforcement and low public awareness are still the main obstacles. In conclusion, the integration of spatial planning policies that pay attention to environmental aspects is very crucial to achieving sustainable development in West Pasaman Regency.

Keywords: Environment; Spatial; Continuity;

Abstrak

Penelitian ini menelaah peran tata ruang dalam menjaga kelestarian lingkungan hidup di Kabupaten Pasaman Barat. Tujuan utama dari penelitian ini adalah untuk mengevaluasi bagaimana implementasi tata ruang dapat mendukung upaya pelestarian lingkungan. Metode yang digunakan adalah analisis deskriptif kualitatif dengan pendekatan studi kasus. Data dikumpulkan melalui wawancara mendalam, observasi lapangan, dan analisis dokumen perencanaan tata ruang. Hasil penelitian menunjukkan bahwa tata ruang yang baik dan terencana dapat mengurangi tekanan terhadap sumber daya alam dan meningkatkan kualitas lingkungan hidup. Namun, tantangan seperti lemahnya penegakan hukum dan rendahnya kesadaran masyarakat masih menjadi hambatan utama. Kesimpulannya, integrasi kebijakan tata ruang yang memperhatikan aspek lingkungan sangat krusial untuk mencapai pembangunan berkelanjutan di Kabupaten Pasaman Barat.

Kata Kunci : Lingkungan; Tata Ruang; Keberlanjutan;

Analysis of Mangrove Vegetation Index Using Landsat 8 Images in Dodinga Bay, West Halmahera

Fri, 28 Mar 2025 00:00:00 +0800

Mangrove vegetation can be easily recognized from remote-sensing satellite images compared to other terrestrial vegetation. The vegetation index is applied to the satellite images to highlight the aspect of vegetation density. This study aims to determine the correlation between the value of the vegetation index and mangrove canopy cover data to achieve a proper vegetation index to estimate the density of the mangrove canopy. The data needed are satellite imagery from Landsat 8 and mangrove canopy cover in sampling locations along the coast of Dodinga Bay, West Halmahera. Image data analysis includes radiometric correction, image sharpening, masking, classification, and accuracy tests. The vegetation index algorithms used were NDVI, GNDVI, and IM, and regression analysis was carried out for correlation tests. The analysis results obtained four different land cover classes with an overall accuracy of 97.70% and a kappa coefficient of 0.9688. The IM vegetation index showed an excellent correlation with mangrove canopy cover compared to GNDVI and NDVI. The determination coefficient (R²) of the IM is 0.6765; GNDVI (0.4897) and NDVI (0.4825). The IM classification produces four levels of mangrove canopy density, i.e., sparse (7.40 ha), moderate (628.33 ha), dense (921.22 ha), and very dense (16.45 ha).

Keywords: mangrove, Landsat 8 images, vegetation index, Dodinga Bay

Abstrak

Objek vegetasi mangrove paling mudah diidentifikasi dengan menggunakan citra satelit penginderaan jauh dibandingkan objek vegetasi darat lainnya. Indeks vegetasi diterapkan terhadap citra untuk menonjolkan aspek kerapatan vegetasi. Penelitian ini bertujuan mengetahui korelasi antara nilai indeks vegetasi dengan data tutupan kanopi mangrove, sehingga didapatkan indeks vegetasi yang sesuai untuk menduga kerapatan kanopi mangrove. Data yang diperlukan yaitu citra Landsat 8 dan tutupan kanopi mangrove di lapangan. Analisis data citra terdiri dari koreksi radiometrik, penajaman citra, masking, klasifikasi dan uji akurasi. Algoritma indeks vegetasi yang digunakan yaitu NDVI, GNDVI dan IM, serta dilakukan analisis regresi untuk uji korelasi. Hasil analisis mendapatkan empat kelas tutupan lahan yang berbeda dengan overall akurasi sebesar 97,70 % dan kappa coefisien sebesar 0,9688. Indeks vegetasi IM menunjukkan korelasi sangat baik dengan tutupan kanopi mangrove dibandingkan GNDVI dan NDVI. Koefisien determinasi (R²) IM adalah 0,6765; GNDVI (0,4897) dan NDVI (0,4825). Klasifikasi IM menghasilkan empat tingkat kerapatan kanopi mangrove yaitu mangrove jarang (7,40 ha), mangrove sedang (628,33 ha), mangrove lebat (921,22 ha), dan mangrove sangat lebat (16,45 ha).

Kata kunci: mangrove, citra Landsat 8, indeks vegetasi, Teluk Dodinga